I need your help in resolving error, while executing following command.
RMAN> backup database plus archivelog tag='Weekly_full_backup' keep until time 'sysdate+7';
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01009: syntax error: found "identifier": expecting one of: "double-quoted-string, equal, single-quoted-string"
RMAN-01008: the bad identifier was:
RMAN-01007: at line 1 column 74 file: standard input